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Nocturnal and diurnal feeding by Galaxias auratus, a lentic galaxiid fish


Stuart-Smith, RD and Barmuta, LA and White, RWG, Nocturnal and diurnal feeding by Galaxias auratus, a lentic galaxiid fish, Ecology of Freshwater Fish, 15, (4) pp. 521-531. ISSN 0906-6691 (2006) [Refereed Article]

DOI: doi:10.1111/j.1600-0633.2006.00192.x


We examined the diel feeding pattern, gastric evacuation and daily ration of a lentic, endemic Tasmanian galaxiid fish, Galaxias auratus. Analysis of stomach contents and consumption estimates based on collections of fish every 3h over three 24-h periods in summer 2002/2003 revealed that feeding always occurred during both day and night, with no obvious peaks. We also estimated the gastric evacuation rate of G. auratus in a laboratory experiment using the two prey species found to be dominant in stomachs of field-sampled fish. The relationship was best described by an exponential model, with rate parameters (R) of 0.104 and 0.081 for the evacuation of the amphipod, Austrochiltonia australis, and the cladoceran, Daphnia carinata, at water temperatures of 11.5 and 16.5°C, respectively. Daily ration of G. auratus in summer was estimated to be approximately 3% (dry body weight) using the models of Elliot & Persson and Eggers. Galaxias auratus appears to be unusual in that its feeding pattern cannot be classified as nocturnal, diurnal or crepuscular, but its gastric evacuation and daily ration estimates are still similar to other comparable Northern Hemisphere freshwater fishes. © 2006 The Authors Journal compilation © 2006 Blackwell Munksgaard.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Freshwater ecology
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Assessment and management of terrestrial ecosystems
UTAS Author:Stuart-Smith, RD (Dr Rick Stuart-Smith)
UTAS Author:Barmuta, LA (Associate Professor Leon Barmuta)
UTAS Author:White, RWG (Professor Rob White)
ID Code:42827
Year Published:2006
Web of Science® Times Cited:8
Deposited By:TAFI - Zoology
Deposited On:2006-08-01
Last Modified:2007-04-27

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